Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0842be585d2a828…

MALICIOUS

PDF

83.5 KB Created: 2021-07-13 01:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be5a6aaa251089216ba0b320b506ce00 SHA-1: db7b1fcc14b890300874e37e737833fdb7a6343e SHA-256: b0842be585d2a828be4f5a38d6c7b74e9d63e7feff0e9cf0d1f1da6e2ff202ca
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL that, while currently marked as benign, is indicative of a phishing or malware distribution attempt. The ML classifier also strongly suggests maliciousness. The document body is heavily obfuscated, preventing a clear understanding of the lure, but the presence of an external URI and the overall detection profile point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8840

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://feedproxy.google.com/~r/sq/ugae/~3/J-SxIuB37Ms/square?utm_term=voluntary+hospital+indemnity+insurance
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7e2f323621b4743e45d65/1625809651497/46811734576.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecbc3408f5654265236bf5/1626127412399/64732746919.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8becef188817f7e23d9a/1626115053114/play_pacxon_online.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8aa4ef188817f7e226bf/1626114724600/14153221417.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e91a542a6f785f583423c7/1625889365102/rakupimuxejibaxakob.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecb5b6f6480a7fcf4b2cba/1626125750586/77194405626.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e965595ebba154a8fe5f0c/1625908569634/63083734144.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c8.bin
a33f65c53edc8b2f83e9aa053f4cfaced62fef69f7e2ff3e68d4969737048ca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 17788 bytes
font_01_sfnt_off00011072.bin
1f4b75bef857cf2b4dbc188234e24c02f99c860fefac3e0956162e75f5e658c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 10960 bytes
font_02_sfnt_off000129c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 16792 bytes

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